diff --git a/include/wx/private/socketevtdispatch.h b/include/wx/private/socketevtdispatch.h
index a7f39bce8e..d474e05f81 100644
--- a/include/wx/private/socketevtdispatch.h
+++ b/include/wx/private/socketevtdispatch.h
@@ -16,6 +16,10 @@
 
 #if wxUSE_SOCKETS
 
+#ifdef __VMS
+#include <sys/socket.h>
+#endif
+
 #include "wx/hash.h"
 
 // forward declarations